RAC 2.3-250-460-A0S-W1 Bosch Rexroth Indramat
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MPN: R911256154
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The Bosch Rexroth Indramat RAC 2.3-250-460-A0S-W1 is part of the RAC Spindle Drive Controllers series and is designed as an AC main spindle drive controller. It features a rated connection voltage of 3 x AC 400 V at 50 Hz with a tolerance of +/-15% or 3 x AC 460 V, and a rated current of 250 Amps. The controller uses an internal blower for cooling, offers a serial interface RS 232-C, and accepts an analog speed command of +/- 10 V.
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Product Description:
The RAC 2.3-250-460-A0S-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat in the RAC Spindle Drive Controllers series. It is intended to govern high-power spindle motors in automated machining centers, supplying regulated three-phase output that helps keep cutting speed constant under load. By accepting motion commands from a CNC or PLC and modulating motor current accordingly, the unit serves as the central drive element for precision metalworking and related industrial automation tasks. Stable spindle control also supports consistent surface finish and predictable tool loading during changing load conditions.
Its input range covers 3 × AC 400 V / 460 V at 50 Hz with ±15% tolerance, allowing direct connection to common plant mains. Under these conditions, the controller provides a continuous output of 250 A, supporting rapid spindle acceleration and sustained heavy machining. The speed reference uses an analog (±10 V) signal, so upstream controls can set spindle speed through straightforward voltage scaling. This approach is well suited to CNC systems that use voltage-based command outputs. Parameter access and diagnostics are handled through an integrated serial RS-232-C interface, which provides access to operating data and fault information. Thermal energy generated by the power electronics is removed by an internal blower, reducing cabinet cooling demands. Control, permit, and status lines terminate at the X4 9-pole terminal, which keeps external wiring organized.
The configuration shipped here is without an additional bleeder, so regenerated energy from rapid deceleration must be absorbed by an external solution when required by the application. It is also without an additional encoder input, so the controller relies on the primary spindle feedback device for speed and position-related control functions. The unit is Series 2 with Version 3 electronics, placing it within that hardware generation of the RAC drive line. This arrangement keeps the feedback path simple in systems that use one spindle sensor.
Frequently Asked Questions about RAC 2.3-250-460-A0S-W1:
Q: What connection voltage is required for operating the RAC 2.3-250-460-A0S-W1 spindle drive controller?
A: The RAC 2.3-250-460-A0S-W1 features a rated connection voltage of 3 x AC 400 V at 50 Hz (±15%) or 3 x AC 460 V.
Q: What is the rated current capacity of the RAC 2.3-250-460-A0S-W1?
A: This spindle drive controller provides a rated current output of 250 A.
Q: How is the RAC 2.3-250-460-A0S-W1 cooled during operation?
A: Cooling is handled by an internal blower with a built-in fan to ensure optimal temperature control.
Q: What type of speed command input does the RAC 2.3-250-460-A0S-W1 accept?
A: Speed commands are received through an analogue input of +/- 10 V on this model.
Q: What extra communication interface is featured on the RAC 2.3-250-460-A0S-W1?
A: A serial interface RS 232-C is included as an additional connection for easy communication.
